This my first experiment with relay, a magnetic switch that can be turned on by Arduino with sharing the same circuit/voltage with the device being turned on. Since the Arduino works safely only under 12V, a relay is used to turn on/off a household appliance under 110V or 220V. In this project, I used the relay merely as a switch, disregarding its significance in high voltage circuit.
Schematics and Solders
Soldering is quite difficult for this project as the parts aren’t soldered unto a PCB board. Instead, they are secured onto the 3D-printed frame individually.
Preview before wiring
It took me a long time to design a station frame that would perfectly fit all the parts and be delicate. The holes are for screws and for installing rubber tips that would secure the whole station on a slippery surface.
Manually turning on device
Wirelessly turning on device
The water pump is not strong enough to suck up the liquid as the pump itself was designed to suck water assuming that there is already liquid inside. In another word, the propeller in the pump does not have strong suction force without being in contact without water. I am currently integrating this project into an automatic indoor garden as a watering device with Arduino monitoring 24/7.